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Klotz foam air filter oil combines leading-edge materials with state-of-the-art technology to offer you the most reliable product in the industry. This exceptional oil is suited for all racing, off-road, and street foam air filter applications. It improves airflow and is incredibly easy to apply. It produces an oil barrier by utilizing a super-viscous formula to trap micron-sized particles that would normally find their way through air filters. The waterproof formula will not gum up and dry out and it prevents clogging when wet.